Inosine, which is sometimes found at the _______ end of an anticodon, can pair with any of the bases normally seen in RNA except _______.
A) 5'; A
B) 5'; C
C) 5'; G
D) 3'; C
E) 3'; G

Question

Quizplus · Accepted Answer

Inosine can pair with any of the four bases normally seen in RNA except for thymine (T). Therefore, the options that include T as a possible base pairing are eliminated. In option C, inosine is paired with cytosine (C), which is a possible base pairing in RNA. Additionally, the question specifies that inosine is sometimes found at the "anticodon" end of an anticodon. The anticodon is located on the tRNA molecule, which is oriented with the 3' end at the bottom and the 5' end at the top. Therefore, the correct answer must have the inosine located at the 3' end (since it is the "anticodon end"), which eliminates choices A, B, and D. Therefore, the correct answer is C.

Inosine, Which Is Sometimes Found at the _______ End of an Anticodon